Quincy air compressor.

[hillbillyhim]

I’m having trouble with my Quincy model 325 compressor. Pumps up then pulls down. Releases pressure then starts pumping up again.

 

[Fritz Maurer]

Is the motor stopping during any of this? If you can hear air at the air cleaner then you have leaking unloader (s) or the exhaust valves are leaking from either being worn out or there is carbon deposits around the valve cages.

Some machines of that era did not have a check valve on the tank inlet, so the exhaust valves must be in good condition if the tank is to be air-tight.

The unloaders are under tank pressure with compressor stopped, so they must be in good condition as well.

When it was working correctly, what tank pressure were you running, and can it reach that pressure now.

 

[JD Dave]

It sounds like a problem with the unloader which releases the compressor valves when the proper pressure is reached. The unloader can be adjusted for the high cutout pressure. Do you have a pressure gauge installed?

 

[hillbillyhim]

I’m having trouble with my Quincy model 325 compressor. Pumps up then pulls down. Releases pressure then starts pumping up again.

I still will pump up to 150 and kick out. It just acts like you guys are saying unloaders.

 

[Destroked 450]

Is it engine driven or electric, I don’t understand what you mean by (pulls down)
The serial number doesn’t help must, the type number above that will
A photo of the back of the compressor would help
A leaking tank check valve will cause multiple issues depending on how the compressor is configured
Engine driven models have a unloader to open the intake valve disc stopping the compressor from pumping air enough through it continues to run, a leaking unloader diaphragm will bleed off air causing the compressor to cycle
Some models have a low oil pressure unloader to make start up of electric models easier

 

[hillbillyhim]

Electric. I tried to load a video but it said it was too big.

 

[hillbillyhim]

Electric. I tried to load a video but it said it was too big.

It pulls down like it’s dead heading. Then it will release and start pumping again

 

[Fritz Maurer]

Is the belt slipping? Is the motor stalling? Either way , when the pump slows down enough , it will unload and spin free, until the rpm gets back up.

 

[hillbillyhim]

Is the belt slipping? Is the motor stalling? Either way , when the pump slows down enough , it will unload and spin free, until the rpm gets back up.

We took guard off the see if I could get the roc. Belts were loose and tightened them up and it seems to be working ok. Thanks to all for the help.

 

[caterpillar guy]

If you get a Saylor- Beall you will be happy they run pretty quite and made in St.Johns MI . I've had one for a year now. I was having trouble finding ones that I could get to run at 175 PSI for truck tires and big tires like grain cart and such. Truck tires take a lot of pressure and grain cart tires take a lot of volume which with that pressure fills them quickly. Dad had a Quincy that he needed parts for and with the model ,serial and bore&stroke they could not offer any help just no information on it. The attitude I got turned me off from ever getting a Quincy compressor. Look at the speed they spin the air pump. The slower the longer they will last. A lot of companies are spinning them faster to get more SCFM out of smaller units. The line going to the tank needs to be a threaded fitting not an aluminum bolted flanged piec for there. The aluminum will leak over time. Friend had one with the aluminum flange bolted deal would leak to no end and would not seal no matter what we did. Even stacking more gasket on to crush more would not seal just blow out and a thin one would not fill the gap. A cast iron one might work. The Saylor-Beall will even let you get an unloader like a truck air compressor has for continuous operation without stopping the electric motor while using so less stopping and starting. There is a switch of some kind to change to a regular stop and start model for occasional use or for end of day shut down.

 

[Fritz Maurer]

I'm looking at purchasing a new air compressor for my shop.
Currently, my first choice is a Quincy QP, 7.5HP 80 gal. I've heard good things about Quincy, but I'm looking for feedback on this specific unit.
Noise is a concern because my shop is in a residential area.

I have also looked at Eaton Compressors, but I've seen mixed reviews on those.

I would never hesitate to buy a Quincy, especially after not one but two side trips with another manufacturer. Both ended up in the scrap pile while the 212 my dad bought in 1952 soldiers on.

That being said, so many things have been outsourced in recent decades that it is hard to keep track of the quality control. Things are just not built with the same longevity concerns today.

I don’t know anything in particular about the model you have selected, but if noise is a concern, 90% of air compressor noise is the air intake. Pumps with 3450 rpm motors make more noise than those with 1750 motors. And those obnoxiously loud oil-free compressors I would not even let in the driveway. Most any compressor can be made quieter with a decent intake air silencing system.

Ultimately, the unit you want is one that you can get parts and service for. I like old compressors and have never found Quincy parts to be a problem. You don’t say who your dealer is, but if you’re getting it from a place like Rural King, can they provide any support at all or are you on your own? It may be worth it to spend the extra $500 to buy it from a real shop that knows air compressors , rather than a box store price and absolutely no knowledge of the unit they sold you.

 

[Destroked 450]

I'm looking at purchasing a new air compressor for my shop.
Currently, my first choice is a Quincy QP, 7.5HP 80 gal. I've heard good things about Quincy, but I'm looking for feedback on this specific unit.
Noise is a concern because my shop is in a residential area.

I have also looked at Eaton Compressors, but I've seen mixed reviews on those.

Quincy QP has a pressure lubricated pump with a reed valve head, this is better than the cheap splash lubricated QT model, but still had the reed valve head of the QT instead of the disc valve head found on the QR series that made Quincy famous

 

[DWF]

I had good luck with a 5 hp 80 gallon Champion compressor where I lived in Minnesota. Sold the place there and the new owner wanted the compressor, so I left it. Moved to Wisconsin and bought the same Champion again. Bought them through TP Tools in Ohio, but the compressors came from Illinois where yhey are made, Have had good luck with both and not too noisy either.
DWF

 

[sotxbill]

Worn out a couple of 175lb IR compressors, went to a 4cyl balanced Quincy, that purrs and havent looked back. The compressor has to large cyls and two small cyls designed to keep them in balance so you dont throw the outside bearings like the typical IR compressors with a big lug and a little lug. AND,, its at least half quieter than the out of balance design... more electric motor noise than the thug, thug, thug, thug of the typical type. Qunicy claims about double the hours of a two lug (out of balance) system, and I believe them.